David Rainoshek's Biodiesel Truck runs on SVO (Straight Vegetable Oil) and WVO (Waste Vegetable Oil). A very good and economic solution for diesel cars, if it's not too cold outside. The car runs 1000 miles on a gallon of diesel, that he needs to start the engine and to put diesel back into the fuel system at the end of the day.
The smell is like that of a Chinese or Asian kitchen. So maybe a little cinnamon oil will do wonders. Can you imagine, a raw foodist who promotes juice feasting in a car with the smell of used oil. A good way to get the attention ;-)